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1 янв 1939 г. - Discovery of Francium

Описание:

Marguerite Perey and Victor Alexander

Добавлено на ленту времени:

The Elementals

ByVelociraptor 26

19 дек 2018

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411

Дата:

1 янв 1939 г.

Сейчас

~ 86 г назад

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